package com.zjz.demo.add;

import java.util.concurrent.Semaphore;
import java.util.concurrent.TimeUnit;

/**
 * Created with IntelliJ IDEA.
 *
 * @Author: zjz
 * @Date: 2021/10/08/20:47
 * @Description:
 * @Target:
 */
public class SemaphoreDemo {
    public static void main(String[] args) {
        // 线程数量:停车位 ! 限流!
        Semaphore semaphore = new Semaphore(3);


        for (int i = 0; i < 7; i++) {
            new Thread(()->{


                try {
                    // acquire() 得到
                    semaphore.acquire();
                    System.out.println(Thread.currentThread().getName()+"抢到车位");
                    TimeUnit.SECONDS.sleep(2);
                    System.out.println(Thread.currentThread().getName()+"离开车位");
                } catch (InterruptedException e) {
                    e.printStackTrace();

                }finally {
                    // release() 释放
                    semaphore.release();
                }

            },String.valueOf(i)).start();

        }

    }
}
